[Webkit-unassigned] [Bug 171602] REGRESSION(r215686): Incremental reads from SharedBuffer are wrong after r215686

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=171602

--- Comment #2 from Alexey Proskuryakov <ap at webkit.org> ---
Comment on attachment 308899
  --> https://bugs.webkit.org/attachment.cgi?id=308899
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=308899&action=review

> Source/WebCore/loader/TextTrackLoader.cpp:103
> -        m_cueParser->parseBytes(segment->data() + bytesToSkip, segment->size() - bytesToSkip);
> +        auto bytesToUse = segment->size() - bytesToSkip;
> +        m_cueParser->parseBytes(segment->data() + bytesToSkip, bytesToUse);
>          bytesToSkip = 0;
> -        m_parseOffset += segment->size();
> +        m_parseOffset += bytesToUse;

There doesn't seem to be a test for this part of the patch. What does this fix?

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